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The FBI searched the office of California state Sen. Ron Calderon on Tuesday but would not disclose the reason for the investigation.

Laura Eimiller, the spokeswoman for the FBI office in Los Angeles, said the warrants were served about 3 p.m. and that agents remained inside the state Capitol in the evening.

She would not disclose the target of the search warrants, but Senate Chief Sergeant-at-Arms Tony Beard told The Associated Press it was Calderon, a Democrat from the Los Angeles County city of Montebello.